Hawaiʻi Volcanoes National Park

From the often-snowy summit of Mauna Loa, the world's most massive volcano, to the boiling coast where lava pours into the sea, Hawaiʻi Volcanoes National Park (car/bicycle or pedestrian 7-day pass $25/12) is a micro-continent of thriving rainforests, volcano-induced deserts, high-mountain meadows, coastal plains and plenty of geological marvels in between.